Structural Changes of the W(211) Surface Induced by Ultrathin Films of Rh, Pt, and Pd†

摘要: A W(211) surface covered with a thin film (between 0.5 and 1 physical monolayer) of Rh, Pt, or Pd is found to exhibit an n × superstructure when annealed above threshold temperature ∼900 K (500 for Pd). The observed using low energy electron diffraction; phase diagrams are presented indicate the coverage range where new structure appears. Scanning tunneling microscopy results that in case Pd/W(211) due missing overlayer rows. In Rh/W(211), there two possible interpretations periodic structure:  either adlayer forms ordered W itself microfaceted {110} faces. On basis our STM observations gas adsorption on surface, we explanation involving microfacets more plausible. careful calibration performed quartz crystal monitor combined progr...